Automatic shut-off for gas-burners.



PATENTED JUNE 11, 1907.

1 E. TAVASTILA.

AUTOMATIC SHUT-OFF FOR GAS BURNERS.

APPLICATION FILED JAN. 23, 1907.

[NVli/V role 2 SHEETS-SHEET 1.

S E s i E N H 7 No. 856,742. PATENTED JUNE 11, 1907.

E. TAVASTILA; 4

AUTOMATIC SHUT-OFF POR GAS BURNERS.

APPLICATION FILED JAN. 23, 1907.

2 SHEETS-SHEET 2.

I By

UNITED. STATES PATENT oFFIoa.

AUTOMATIC SHUT-OFF FOR GAS-BURNERS-.

. Specification of Letters Patent.

Patented June 11, 1907.

Application filed January 23, 1907. Serial No. 353,715-

To all whom it may concern:

Be it known that I, EMIL TAvAsrILA, a citizen of the UnitedfStates of America, residing at Donora, inthe county of Washington and State of Pennsylvania, have invented certain new and useful Improvements in Automatic Shut-Offs for Gas-Burners, of which the following is a specification, reference being had therein to the accompanying drawmg.

This invention relates to automatic-shut ofi's for gas burners, and the invention has for its object to provide a novel-shut ofi wherein positive and reliable means are employed for automatically closing a valve that controls the sup ly of gas'to a burner.

Anot or object of this invention is to provide a novel shut ofi that can be used in con- 'nection with a burner of a stove and lam whereby should the supply of gas be shut 0 unbeknown to 'the occu ants of a room or compartment in which t e burner is located, my lmproved shut ofi' will be immediately actuated to close a valve and prevent the es-- in the novel. construction, combination and 'arran ement of parts to be hereinafter more fully described and thenspecifically pointed out in the appended claims:

. Referring to the drawing forming art of this specification, like numerals of re erence designate corresponding parts throughout the several views, 1n which:

Figure 1 is a perspective view of a portion of a stove and burner equipped with my improved shut-off, Fig. 2 1s an elevation ofa portion of the shut ofl, Fig. 3 is a plan of the i a same, Fig. 4 is an elevation of the shut off de-.

' arrange signed fora lam fixture, Fig. 5 is a vertical sectional view 0 a portion of the same, and.

My invention resides in interposing a valve casing 6 upon the gas supply piped,

stem 7. The upper en of the valve stem 7 is provided with a thumb piece 8 and with an outwardly extending indicator arm 9, carrying a fan-tail shaped signal plate 10. The

collar 12 having a notch 14 formed therein.

The valve casing 6 supports an integral tubular extension 15 and connecting with said extension is a coiled spring 16Which passes around the collar 12 and is secured to said collar as at 17. The sprin 16 is employed fornormally holding the co lar in a fixed position.

The gas supply pipe 4 beneaththe valve casing 6 is provide with a T connection 18, which supports a bracket 19, said bracket burner 2. The bracket carries an upwardly extending arm 20 and to the upper end of said arm is adjustably connected-a stri of non-fusible metal 21 capable of ex an ng and contracting. The opposite on of the 22 carryinga dependingarm 23 to which is pivotally connected a washer 24. The Washer 24 is provided with an u wardly extending lug 25 and extending t ough said washer into the sleeves 15 and 22 is a slidable rod 26. A coiled spring 27 is loosely mounted upon the rod 26 and between the sleeve '22 and the Washer 24 to normally hold the washer against inward pivotal movement and loosely upon the rod 26. A coil spring shown in dotted lines is placed within the sleeve 22 and behind said rod 26, normally forcing the rod outward and into engagement with the collar 12. By said means as said rod 26 will have free and assistant movement in an outward direction toward the collar 12, being so impelled by the hidden spring sion of the strip 21. It is pointed out,'however, that in contracting, the strip 21 will draw inwardlythe sleeve 22 and arm 23. By this movement the pivoted washer 24 will be tilted outward thus gripping the encircled rod 26 and carrying the latter inward and described, it will be readily understood that within the sleeve 22 and also by the expanout of engagement with the collar 12. In

said valve casing havin an elongated valve stem is also provided with an outwardly extending finger 11. Revolubly mounted upon the stem 7 and upon the valve casing 6 1s a being located within the stove 1 beneath the strip 21 is provided with a permanent sleeve I tained under tension by the end of the rod 26 engaging the notch 14 of the collar 12 through the agency of the hidden spring within the sleeve 22. The valve stem is then turned rearwardly until the indicator arm 9 is at right angles to the gassupply inlet nipple 29, this position of the arm and signal plate 10 indicating that the valve is open and that gasis passing into the .burner 2. U on the gas being ignited, the strip of meta 21 expands and further tends to hold the rod 26 in engagement with the collar 12: Should the gas supply be shut off unbeknown t the occupants of the com artment in which the gas stove is located, t e cooling of the strip of metal 21 will cause the same to contract and withdraw the pin 26 from the notch 14 of the collar 12. The coiled spring 16 which has been under tension revolves the collar 12 causing the pin 28 to engage the finger 1 1 and turn the valve stem 7, closing the gas supply pipe and preventing gas from entering the urner, the closing of-the valve being indicated by the change in position of the signal Upon again revolving the valve plate 10. stem 7 to turn on the gas the plate will be brought forcibly in contact with the lug upon the washer 24, thus tripping the latter out of its temporary engagement with the encircled rod 26 and allowin said rod to move outward to engage the co lar 12, under the influence of the hidden spring within the sleeve 22.

In Figs. 4 to 6 inclusive, I have illustrated the ap lication ofmy improved automatic shut 0 to a lamp fixture. The gas supply pipe 30 is providedwith a valve 31 having a valve stem 32, the lower end of which is pro- 'vided with a thumb piece 33 while theup er end of said stem is provided with a beve ed segment-shaped in 34. A coiled spring 35 is mounted upon t e valve stein 32 beneath the valve. 31 to normally hold the stem 32 in its seat. The valve stem 32 providedwith a finger 36 for engaging the upwardly extending pin 37, carried by a collar 38 revolubly mounted upon the stem 32 and valve .31. Connecting with the collar 38 is a coiled 1 spring 39, which is connectedto'the lampfixture as at 40. The collar 38 is notched as at41, similar to the collar 12 previously described' The gas supply pi e 30 is provided with an upwardly extending bracket 42 overhanging the globe and mantle of the lamp fixture. The lamp fixture beneath the burner is provided with a bracket 43 supporting a vertically disposed sleeve 44 into which a rod 45 is slidably mounted. The

rod 45 being also slidably mounted within a sleeve 46, and said-sleeve permanently secured to a strip of metal 47 which in turn is adjustably connected as at 48 to the upper end of the bracket 42. The strip of metal 47 has the properties of expansion and contrac: tion. The sleeve 46 is provided with a depending arm 49 carrying a pivoted washer 50 similar to the washer 24 previously described. interposed between the washer 5O and the lower end of the sleeve 46 is a loosely mounted coiled spring 51 for nor mally holding the washer in a horizontal position. The end of the rod '45 is adapted to engage in the notch 41 of the collar 38, when the same is rotated by the finger 36 of the valve stem 32 engaging the pin 37 of the collar 38. When the strip of metal 47 contracts by the gas supply being shut ofi, the rod 45 is adapted to release the collar 38 and valve stem 32 to close the valve 31. The

function and operation of the remaining parts is identical to that of correspondmg parts heretofore fully described in connection with my improvement as applied to a stove. it will be noted however, that the beveled segment-shaped lug 34 is employed for tripping the washer '50out of its tempo-v rary engagement with the rod 45. This being accomplished automatically by said lug being forcibly brought beneath and elevating said washer upon manually revolving the IQO valve stem 32 to" turn on the gas. In this manner the escape of gas will be' revented when the supply is shut ofl unbe own to the owners of the lamp fixture,

From the foregoing it will be observed that I have devised a novel shut off for gas burners whichis automatic and ositive in its action. I do not care to con e myself to the specific arrangement of the various parts of my improved shut ofi or to its application entirelyto a stove or lam fixture.

'Such changes in the size, an minor details a of construction a s are ermissible'by the appended claims, may e resorted to Without departing from the spirit and scope of the invention.

I What I claim anddesire to secure by Ltters Patent, .is:

1. In an automatic shut tion with a gas sup ly pipe and burner,-of a valve controlling t e supply of gas to said burner, a valve stem for operating said valve,

for moving said stem and a strip of metal ar ranged'in close proximity to said burner,

sleeves mounted upon-said strip of metal and said valve and aslidable spring-pressed rod ofi the combina a spring held collar mounted upon "said. valve carried partially within said sleeves, a projecting end of said rod adapted to engage a notch in the periphery of said collar, a pivoted washer encircling said rod and adapted to engage the latter during movement in only one direction, said strip of metal being expanded and contracted by the action of said burner.

2. An automatic shut off consisting of a valve, a valve stem for operating said valve,

i said valve for operating said stem, and a s idable spring-pressed rod in engagement with an expansible metallic strip and adapted to engage said collar for normally holding the latter in a fixed position, a pivoted washer encircling said rod and adapted to temporarily engage the rod and a lug mounted upon the valve stem for trippin the washer out of engagement with said ro In testimony whereof I-afiix my signature in the presence of two witnesses.

EMIL TAVASTILA. Witnesses:

FRANK SIRCU, OTTO GUsTAFsoN. 

